Verizon FIOS routers totally suck. I have two one at my home and one at my office several blocks away. IN BOTH CASES I either a. cannot connect to 2.4 gz OR b I get thrown off the 2.4gz. So there is no way I can print or use other devices.

I AM SO DONE WITH VERIZON -- 2 hours on the phone and the best they can do is blame my mac -- REALLY?????????

If you're seeing issues with a Mac, log into your router and make sure the DTIM interval is set to 3 for 2.4Ghz and 5Ghz. You'll find this under the Advanced Wireless Settings. Also, connect your Mac to the 5Ghz network and not 2.4Ghz network unless you need 2.4Ghz.

I was having the same issue, started 2-3 weeks ago as well. My wifi extender also stopped working. Yesterday I got a new wifi extender, thought the issue was that.

Luckliy, I found this thread, after reading the posts.

I just went into my router settings and disabled the 2.4ghz network which disable all internet. I had to plug in my ethernet cable signed back into router setting, re-enabled the 2.4ghz network and now I'm able to connect to the 2.4ghz network with no issue and also my old wifi extender works again